Face-plate-holding means.



B. M. W. HANSON.

PAGE PLATE HOLDING MEANS.

APPLICATION FILED 0014, 1909.

974,057. Patented 0011.25, 1910.

' Witneses: I 3 11201 12607; I

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UNITED STATES PLIENT OFFICE.

- BENGT W. HANSON, OF HARTFORD, CONNECTICUT, ASSIG-NOR TO PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF- NEW JERSEY.

a face-plate in a true position or one racn-rna'rn-nornme means To all whom it may concern:

Be it known that I,BENG'T M. W. HANSON, citizen of the United States, residing at Hartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Face- Plate-Holding Means, of which the following is a specification.

This invention relates to face-plate holding means and the primary object of the invention is to provide simple and effective means for solidly and substantially holding pendicular to the axis of the spindle, the construction being such that I can ade uatel compensate for wear between said ace-p ate and spindle and this without chattering so that precisenessand accurac in results are assured.

In the drawings accompanying and forming part of the present-specification I represent in detail one form of embodiment of the invention which to enable those skilled in the art to practice the same will be set forth fully in v the following description while the novelty of the invention will be included in the claims succeeding said description. I

-Referring to said drawings, Figure 1 is a front elevation of a face-plate including my invention, a portion of the same, for economyin space, being removed, and, Fig. 2 is a sectional detail view of the face-plate and said holding means, a portion of the head-stock of alathe being also shown.

Like characters refer to'like parts throughout both figures. c

' The invention hereinafter described may be employed with advantage in connection with vario s styles of lathes and in Fig. 2 of the drawings thereis shown a very small portion of a head-stock of such a machine the same being denoted by 5. The spindle associated with said head-stock is denoted by 6 and except as hereinafter pointed out may follow the construction of those at presentin use. Said spindle 6 is illustrated as snrrounded by an externally-tapered sleeve 7 fitting a correspondingly tapered opening in the head stock 5 and which as is the custom is-utilized to compensate for wear between the head stock and spindle being held in operative position by check-nuts only one of which'is shown being designated byS.

The face-plate is denoted by and it has Specification of Letters Patent.

Application filed October 4, 1909. Serial No. 520,778.

per"

Patented Oct. 25, 1910.

'the familiarradial slots 10 serving their usual ofiice. The said face-plate 9 has a central opening 11 the wall of which is on a back or outward taper and this tapered portion is adapted to fit upon the .similarly tapered portion of the head or enlarged forward end 12 of the spindle. It is common to fit a face-plate onto the, cylindrical forward end of a'spindle in which event the rear face of the face-plate bears against a vertically-disposed surface or shoulder on the spindle and while initially -in such a construction as this, it is possible to rigidly secure the face-plate in a vertical position, in time it is impossible toattain these functions the consequence being in operation that not only is it not possible to maintain the face-plate truly perpendicular to the axis of the spindle but it cannot beheld against wabbling or vibration and the natural result is an inferior grade of work. In view of ,the conical or tapered seat in the face-plate and the conical or tapered bearing fitting this seat I find that in practice I can under all conditionssolidly hold the face-plate absolutely at right-angles to the spindle and not only this but I can properly take-11p wear between the two parts. Then also I provide an ample bearing for ,the face-plate. From what has been stated it will be clear that itis necessary to move said face-plate to take up wear therein and while various devices may be prpvided for this purpose I prefer to provide screwthread means for the purpose and the same may be operatively associated with the faceplate in different ways the preferable one of which I will now set forth.

The presence of the enlarged tapered head 12 produces a shoulder or vertical surface 13 and I have shown as disposed betweenthis shoulder and the forward end of the sleeve 7 an externally threaded collar 14 which surrounds the said spindle. In the present case this collar is non-rotative with respect to the spindle or is rotatively connected with said spindle and for this purpose a pin 'as 15 may be provided said pm being driven-into a socket in said spin:

rear or back side of the face-plate 9, a hub 17 which is interiorly threaded to correspond with and to receive the externallythreaded portion of the collar 14.

It will be observed that said collar l t loosely fits the spindle 6 immediately back of the tapered nose or head 12 thereof and there are several advantages following this feature as will now appear. In the first place I find that no great accuracy is required in forming the threads on said collar their only function being to draw the faceplate backward to seat the same solidly on said tapered nose or head or to take up wear therein. Then also the collar when utilized for the ofiice stated does not bear against the circumferential portion of the spindle so that when an adjustment has been secured there is no reaction between such circumferential portion and the collar. Ease of assemblage also accompanies the described construction.

I desire to state at this point that I use the title face-plate holding means as applied to my invention simply for convencompensate for the wear to which I ha re referred.

. I do not restrict myself to the construction hereinbefore described as I may make many changes within the scope of my invention as expressed in my claims.

\Vhat I claim is:

1. The combination of a spindle having a tapered portion, a work holding device having a tapered opening to adjust-ably receive said tapered portion, and means located at the rear of the front face of said work holding device for drawing the latter onto said tapered portion.

2. The combination of a spindle having a tapered portion, a work holding device having a tapered opening to adjustably receive said tapered portion, and threaded means located at the rear of the front face of said work holding device for drawing the latter onto said tapered portion. 7

3. The combination of a spindle having a tapered portion, a work-holding device having a tapered opening to adjustably receive said tapered portion, and a collar loosely fitted on the spindle, non-rotative therewith and also immovable in the direction of the axis of the spindle, said collar having a threaded connection with said work-holding device and being adapted on the turning of said work-holding device to draw the latter onto said spindle.

In testimony whereof I aflix my signature in presence of two witnesses.

BENGT M. IV. HANSON.

\Vitnesses:

HEATH SUTHERLAXD, \V. M. S'ronns. 

